Hydraulic apparatus

ABSTRACT

Tool or adaptor for receiving a tool for securing in a mounting head, including a fork-shaped mounting lug which projects in the direction of displacement and has an enlarged retaining opening starting from a smaller insertion opening.

[0001] The invention relates first of all to a hydraulic apparatus, forexample for pressing or cutting workpieces, with a mounting head fortools which can be moved against one another.

[0002] An apparatus of this kind is known, for example, from GermanPatent Application 198 25 160, which corresponds to U.S. applicationSer. No. 09/319,908, Aug. 10, 1999. The content of this patentapplication is hereby incorporated as to its full content into thedisclosure of the present invention, also for the purpose ofincorporating features of this patent application into patent claims ofthe present invention.

[0003] With regard to the prior art described above, one technicalproblem for the invention is seen in improving the construction of ahydraulic apparatus of the type under discussion, particularly asregards its technical functioning.

[0004] This problem is solved first and foremost by the subject matterof claim 1, it being proposed that the tools can be arranged in themounting head in a manner laterally offset from one another in order, inthe case of cutting tools, to allow them to move past one another. As aresult of this configuration, there is provided increased utility valuefor the hydraulic apparatus, especially when using cutting tools. In thecase of a cutting operation, a movable cutting tool is displaced atleast until its cutting edge moves behind the cutting edge associatedwith the fixed tool. This makes it possible to cut workpieces, such assolid or hollow sectional bars, to length cleanly and without burrs. Thefact that the cutting tools can be moved past one another leads to ashearing division of the workpiece. The laterally offset arrangement ofthe tools relative to one another in the mounting head is furthermorealso conceivable in the case of tools for pressing workpieces. Thearrangement chosen also makes it possible to insert in the mounting headtools for other non-cutting operations on workpieces, bending tools forexample. In a first embodiment, the tools are guided in grooves formednext to one another. In this regard, it is possible for a groove to beassociated with each tool. However, it is furthermore also conceivable,given the formation of two grooves arranged next to one another, toassociate these two tools in such a way that they are guided in commongrooves formed beside one another. As a further embodiment of thesubject matter of the invention, it is provided that the tools areguided in a common groove with additional support on opposite outersurfaces of groove walls. Irrespective of the number of grooves, theyrun in the direction of displacement of the tool or tools in themounting head. Where the tools are arranged in a common groove, eachtool preferably also engages over the associated groove wall boundingthe groove to provide additional support against the outer surface ofthe groove wall. Metaphorically speaking, the construction is chosen insuch a way that the workpiece, the groove and the groove wall of themounting head forms a guide rail for the tool in the form of a tongue.Provision is furthermore made for grooves or guide structures for thetools to extend in the direction of displacement and to be provided onboth sides of the tools, in order to provide tilt-free guidance of thetools. Where the tools are arranged in a common groove, the tool sectionsliding in the groove preferably corresponds to no more than half thewidth of the groove, so that both tools may be moved fully past oneanother. In another embodiment, it may be provided that the tools areguided in a common groove and interpenetrate one another. Accordingly,the tools are shaped in such a way that in particular the operativeregions of the tools, for example the cutting edges of cutting tools,can enter into the region of the other tool. Thus, for example,provision is made for the tools to have guiding sections in the form oftongues for guidance in the common groove only in the end regions whichare directed away from each other. These guiding sections extend overthe entire width of the groove, whereas the actual operative regionpreferably corresponds to half the width of the groove, to allow theoperative regions of the tools to move past one another. In anadvantageous development of the subject matter of the invention, it isprovided that the mounting head is formed as a closable rectangularguide. In this way, on the one hand, insertion of the various tools isfacilitated, and, on the other hand, by means of the opened rectangularguide, the apparatus can be placed against the workpiece to be pressedor cut. This is of advantage, particularly in the case of very longworkpieces or those in locations to which it is difficult to gainaccess. After it has been placed against them, the mounting head formedas a rectangular guide is closed, after which, as a further feature ofthe subject matter of the invention, the displaceable tool is acted uponin the rearward direction by a ram which can be actuated by means of thehydraulic apparatus. After the rectangular guide is closed, thedirection of displacement of the movable tool runs in extension of thedirection of displacement of the ram. The movement concerned ispreferably a linear displacement of the ram and of the displaceable tooltowards a fixed tool. Where the mounting head is formed as a rectangularguide, the longer side of the rectangle is aligned in the direction ofdisplacement, at least in the closed position of the mounting head. Aquadratic shape of the mounting head when viewed transversely to thedirection of displacement of the tools is furthermore also conceivable.It is also possible to conceive of arrangements of the mounting head inwhich the displacement of the tools is effected in a nonlinear manner,for example in the form of a cam-guided displacement. In the preferredconfiguration of the mounting head as a rectangular guide, provision ismade for the rectangular guide to be of three-piece construction, onepiece being provided as an angled piece which encloses one longitudinalside, one piece being provided as a narrow-side piece and one piecebeing provided as a longitudinal-side piece. In this regard, it isfurthermore preferred for the narrow-side piece to provide joints ateach of its ends for the angled piece and for the longitudinal-sidepiece. It is proposed here that the narrow-side piece be provided in theregion that can be associated with the apparatus. The narrow-side piececan furthermore be provided in the form of two lug-like plates whichenclose end regions of the angled piece and of the longitudinal-sidepiece between them, the ram which can be moved by the hydraulicapparatus entering the guide space of the mounting head in theintermediate space provided between these plates. As a development ofthe subject matter of the invention, provision is made for the angledpiece to provide a portion of a longitudinal side which overlaps withthe longitudinal-side piece. As a consequence of this, the angled pieceis formed to be substantially U-shaped in a side view transverse to thedirection of displacement, with one U limb forming a longitudinal sidewhich is arranged to be shorter than the other U limb, the free end ofthe other U-limb being provided with a bearing feature to allow pivotingdisplacement of the angled piece in the region of the narrow-side piece.In the closed position of the mounting head or rectangular guide, theshorter U limb coincides with the longitudinal-side piece, which islikewise mounted in a pivoting manner on the narrow-side piece, thisposition preferably furthermore being secured by positive locking. Thus,for example, one longitudinal side of the angled piece can have an upperprojection which is provided with an undercut and enters into acorrespondingly formed groove in the longitudinal-side piece. Thepieces—angled piece and longitudinal-side piece—which are subject tospring-loading in the opening direction, are held in the closed positionby the selected undercut. This position can only be released bydeliberate action. To fix the tools in the mounting head, securing meansfor securing a tool in the mounting head are provided, in each caseopposite one another, on the narrow-side piece of the mounting head. Aconfiguration is preferred here in which a securing means is provided onthe ram side for the tool to be acted upon by the ram and thusdisplaced, and a further fixing means for a fixed tool is, on the otherhand, provided in the region of the U-limb of the angled piece whichsimultaneously forms a narrow-side piece. A configuration which ispreferred here is one in which the securing means is formed as apositive-locking pin which can be displaced transversely to thedirection of motion of the tools. This is furthermore preferably in theform of a pin which has zones of reduced diameter in a longitudinaldirection and is biassed by a spring in the direction ofpositive-locking engagement. Provision can furthermore be made for thispositive-locking pin to be formed and arranged in such a way that byusing it, there can be effected both fixing of the associatable tool toone or the other side of the narrow-side piece or of the ram and,furthermore, fixing of it on both sides at the same time.

[0005] The invention furthermore relates to a hydraulic apparatus, forexample for pressing or cutting workpieces for instance, with a mountinghead for tools which can be moved against one another, both cutting andpressing tools being disposable in the mounting head. As an advantageousdevelopment of the subject matter of the invention, it is proposed herethat force-dependent control of the apparatus is effected both during acutting operation and during a pressing operation. As a consequence ofthis, its operation is not dependent on the drive path of the ram or ofthe tool that can be displaced by the ram. As a consequence, varioustools with various displacements can be inserted and used in anextremely simple manner.

[0006] The invention furthermore relates to a tool or adaptor forreceiving a tool for securing in a mounting head. For advantageousdevelopment of a tool or adaptor of this kind, a fork-shaped mountinglug projecting in the direction of displacement is here proposed whichhas an enlarged retaining opening starting from a smaller insertionopening. This retaining opening, which preferably cooperates with apositive-locking pin of the mounting head, serves to fix the tool in themounting head, thus for example to locate the tool on the mounting headas a fixed tool or to locate a tool on a ram projecting into themounting head to form a displaceable tool. The positive-locking pincooperating with the mounting lug has a region of reduced cross sectionin the longitudinal direction of the pin, the diameter of whichcorresponds approximately to that of the smaller insertion opening ofthe mounting lug. To fix the workpiece, the positive-locking pin isdisplaced in such a way that the region of reduced cross section can betraversed by the smaller insertion opening of the mounting lug for finalentry of the positive-locking pin into the enlarged retaining opening.The positive-locking pin is displaced back into the original position,preferably with spring assistance, positive engagement being effectedbetween the pin area of enlarged cross section and the enlargedretaining opening. As a further embodiment of the subject matter of theinvention, provision is made for the mounting lug to be arrangedrelative to the tool or to the adaptor so as to project transversely tothe direction of displacement. As a result of this, there is providedincreased width of the mounting lug. In this regard, the mounting lugcan be provided as a separate part which is, for example, rivetted tothe tool. As an alternative, the construction can also be chosen in sucha way that the mounting lug is formed to be aligned with the outersurface of the tool or of the adaptor. According to this, it ispreferred that the mounting lug be formed integrally with the tool. Thetool and the adaptor have means for guiding them in the mounting head.In regard to a plan view of these guide means, the mounting lugpreferably extends to the side of the guide means and with a paralleloffset relative to the means. It is furthermore proposed that twooppositely-located mounting lugs be provided. According to this, thetools grip over the associated sections of the mounting head in theregion of their mounting lugs. As regards the guide structures, it isproposed that the tool or the adaptor have one or, optionally, twotongues located beside one another and extending in the direction ofdisplacement of the tool or of the adaptor, these tongues resting in oneor, if appropriate, two mutually adjacent grooves in the mounting headto form a tongue-and-groove arrangement. As a development of the subjectmatter of the invention, provision is made for the tool or the adaptorto have a tool working width which is less than the tongue width. Thus,for example, the tool working width can correspond approximately to halfthe tongue width, and it is furthermore preferred that the workingsection of the tool be aligned on one side with a tongue outer surfaceand thus extend approximately as far as the centre of the tongue in thewidth direction. As an alternative, the arrangement can also be chosenin such a way that the tool working width is adapted to approximatelycorrespond to the tongue width. It is furthermore proposed that thetongue extend over only part of the length of the tool or of theadaptor, for example over half the length of the tool as viewed in thedirection of displacement of the tool. Provision can furthermore be madefor the adaptor to have a projecting shoulder on both sides of thetongue. The tool accordingly has a total width which extends beyond thewidth of the tongue and the tool is thus supported in the mounting headin the region of the projecting shoulder on the groove flanks, whichreceive the tongue between them. As an alternative, it is also possiblefor the side face of the adaptor to be aligned with the side face of thetongue. The adaptor according to the invention is furthermore formed insuch a way that it allows conventional pressing tools—pressing jaws—tobe inserted. Thus, for example, positive-locking openings can beprovided for the purpose of fixing the tool on the adaptor. This can befor example a kind of catch coupling. A tongue-and-groove connectionbetween tool and adaptor is furthermore also conceivable, the alignmentof this groove and tongue preferably being transverse to the directionof displacement. The tool can furthermore be held in the adaptor bylatching means, which latching means can be displaced to release thetool only by deliberate action. As regards the fixing of the tool in theadaptor, combinations of the configurations described above can also beused. In this regard, it is furthermore proposed that the securing lugbe provided on the tool and that the securing lug engage over theadaptor. The adaptor itself is accordingly not provided with securinglugs and thus serves purely as a guide means in the mounting head. Thetool provided with the securing lug, preferably two securing lugs, gripsover the adaptor to give positive-locking engagement with the securingmeans of the mounting head. The tool according to the invention or thetool held by means of the adaptor preferably acts within the mountinghead of the apparatus, i.e. the tool working regions, such as cuttingedges or pressing jaws, act within the mounting head. As an alternative,however, provision is also made for the tools or tool working regions tooperate outside the mounting head, thus for example in the form of atool of the bolt-cutter type. Here, the only tool members which aredisplaced within the mounting head are those whose displacement istransmitted for example by a lever arrangement, to cutting or pressingjaws arranged offset relative to the mounting head. Such a configurationcan furthermore also be used for punching, for example punching sheetmetal. As a consequence, operations may in this way also be performed ina targeted manner without having to open the mounting head, particularlyin the case of relatively long workpieces, in order to grasp theworkpieces.

[0007] The invention furthermore relates to a pair of tools forinsertion in a mounting head of a hydraulic apparatus. Here, anadvantageous development of the pair of tools according to the inventionis provided by cut-outs formed identically in both tools andcorresponding to a profile cross section. Such a pair of tools is used,for example, for cutting to length profile stock pieces made, forexample, of plastics or aluminium, the cut-outs in the two tools beingprovided to correspond to the profile cross section of the stock to becut. In an initial position of the apparatus holding the pair of tools,the cut-outs coincide. The profile stock is then pushed through these asfar as the desired position. When the apparatus is actuated, the tools,which are aligned in side by side disposition, are moved past oneanother, resulting in shearing of the profile stock. Owing to the factthat the cut-outs of the tools are shaped to correspond to the profilecross section, the cutting operation takes place without permanentdeformation of the workpiece. Another advantageous configuration isprovided by cutting edges formed on end faces, the end faces beingopposite one another in the direction of displacement, and the cuttingedges extending in a curved manner in the direction of displacement.Cutting edges which extend in a concave manner relative to therespective end face of a tool are preferred here, so that concentriccutting from the outside towards the centre is effected, particularly inthe case of workpieces which are circular in cross section. Externallythreaded sections which adjoin the cutting edges laterally and arealigned transversely to the direction of displacement furthermore allowthreaded rods to be cut to length. For this purpose, the tools areprovided with semicircular recesses which are open towards the oppositeend faces and have an external thread extending in the transversedirection of the tool. To counteract skewing of the workpiece, e.g. athreaded rod, provision is made for one tool to have a shell-shapedsupport on the side facing away from the cutting edge, the shell beinglocated at a spacing from and coaxial with the externally threadedsection. The support arrangement is preferably effected on the movabletool, a supporting shell which is in the form of a half shell in planview being chosen. In this arrangement, the shell is aligned counter tothe associated externally threaded section, with the radii beingsubstantially the same.

[0008] The invention furthermore relates to a tool for securing in amounting head of a hydraulic apparatus, in particular a hydraulicapparatus according to one or more of claims 1 to 10 or especiallyaccording thereto. In this regard, a receiving member to be secured inthe mounting head and a working part situated outside the mounting head,such as a cutting jaw or a hole punch, are proposed for the purpose ofachieving a technically functional improvement of the subject matteraccording to the invention. By virtue of this configuration, operationsto be carried out by means of the hydraulic apparatus can also beperformed outside the region of the mounting head, and linear movements,in particular, can be transmitted in various ways to the working part bythe receiving member on the mounting side. Thus, provision is made forthe receiving member to comprise a fixed part and a moving part. Thedisplacement of a ram or piston brought about by means of the apparatusleads to the moving part being taken along in the manner alreadydescribed in the case of the tools or adaptors with tools acting withinthe mounting head. In a configuration used by way of example, provisioncan be made for the moving part to be formed as a piston cooperatingwith a quantity of hydraulic fluid in the fixed part. As an alternative,provision can be made for the moving part to act directly or indirectlyby way of linkages on a hydraulic piston. The moving part canfurthermore also act on the working part directly or indirectly by wayof links or the like. It is furthermore proposed that the tool is ashears-type tool, thus for example a bolt cutter. Thus, provision ismade for the fixed part to be connected to a fixed jaw of theshears-type tool. Another proposal in this regard is that the movingpart be connected to a pivoting jaw of the shears-type tool. Accordingto the invention, a preferred linear displacement of the moving partaccordingly leads by way of appropriately embodied and arrangedlinks/levers to a pivoting displacement of the pivoting jaw relative tothe fixed jaw. As an alternative, provision can be made for the tool tobe a hole punch. A device of this kind is known from DE-A1 196 49 932.The content of this patent application is incorporated into thedisclosure of the present invention, also for the purpose of includingfeatures of this patent application in claims of the present invention.It is additionally proposed that the moving part be formed as a cylinderaccommodated in the cylinder-like fixed part, thus for example ahydraulic piston.

[0009] Finally, the invention relates to a method for cutting by meansof a hydraulic apparatus in which tools which can be moved against oneanother are accommodated in a mounting head. To obtain an improveddevelopment of such a method, it is proposed here that, as regards thecutting edges, the tools should be guided past one another in the courseof a cutting operation. The guidance of the tools past one another ispreferably effected until they reach a position in which—viewed in thedirection of displacement, the cutting edge on one tool lies behind thecutting edge of the other tool.

[0010] The invention is explained in greater detail below with referenceto the attached drawing, which represents merely a number of exemplaryembodiments. In the drawing:

[0011]FIG. 1 shows a hydraulic apparatus according to the invention,with a mounting head for receiving tools, the apparatus being operatedby means of an electric motor;

[0012]FIG. 2 shows another perspective view of a hydraulic apparatus inthe form of a manually operated apparatus;

[0013]FIG. 3 shows a perspective detail view of the mounting head in anopen position;

[0014]FIG. 4 shows another perspective view of the mounting head seenfrom the rear;

[0015]FIG. 5 shows a perspective view of the mounting head in openposition, with various tools associatable with the mounting head, in theform of cutting tools;

[0016]FIG. 5a shows another perspective view of the mounting head inopen position, with various adaptors associatable with the mountinghead, together with tools in the form of pressing inserts;

[0017]FIG. 6 shows a side view of the mounting head in operatingposition, with cutting tools arranged in the mounting head, in a firstembodiment;

[0018]FIG. 7 shows the section according to the line VII-VII in FIG. 6;

[0019]FIG. 8 shows the section according to the line VIII-VIII in FIG.6;

[0020]FIG. 9 shows the section according to the line IX-IX in FIG. 8;

[0021]FIG. 10 shows an enlargement of the region X-X in FIG. 7;

[0022]FIG. 11 shows a perspective detail view of the tools used in theembodiment according to FIG. 6 to 10;

[0023]FIG. 12 shows a view corresponding to that of FIG. 6 but with themovable workpiece displaced fully forwards;

[0024]FIG. 13 shows a sectional view corresponding to that of FIG. 7,but relating to the position according to FIG. 12;

[0025]FIG. 14 shows a partially sectioned side view of the mounting headwith tools of a second embodiment;

[0026]FIG. 15 shows the section according to the line XV-XV in FIG. 14;

[0027]FIG. 16 shows the section according to the line XVI-XVI in FIG.14;

[0028]FIG. 17 shows a perspective detail view of the tools used in theexemplary embodiment according to FIGS. 14 to 17;

[0029]FIG. 18 shows a partially sectioned view corresponding to that ofFIG. 14, with tools in a third embodiment;

[0030]FIG. 19 shows the section according to the line XIX-XIX in FIG.18;

[0031]FIG. 20 shows the section according to the line XX-XX in FIG. 18;

[0032]FIG. 21 shows a perspective detail view of the tools used in theembodiment according to FIG. 18 to 20;

[0033]FIG. 22 shows a side view of the mounting head, with tools of afourth embodiment;

[0034]FIG. 23 shows the section according to the line XXIII-XXIII inFIG. 22;

[0035]FIG. 24 shows another side view of the mounting head with tools ina fifth embodiment;

[0036]FIG. 25 shows the section according to the line XXV-XXV in FIG.24;

[0037]FIG. 26 shows the mounting head in side view with tools in a sixthembodiment;

[0038]FIG. 27 shows the section according to the line XXVII-XXVII inFIG. 26;

[0039]FIG. 28 shows another side view representation of the mountinghead with tools of another embodiment;

[0040]FIG. 29 shows the section according to the line XXIX-XXIX in FIG.28;

[0041]FIG. 30 shows a side view representation of the mounting head withtools of an eighth embodiment;

[0042]FIG. 31 shows the section according to the line XXXI-XXXI in FIG.30;

[0043]FIG. 32 shows another side view representation of the mountinghead with tools of another embodiment, in which working sections of thetools act outside the mounting head;

[0044]FIG. 33 shows the section according to the line XXXIII-XXXIII inFIG. 32;

[0045]FIG. 34 shows a perspective view of an alternative tool in amounting head, for forming a hole punch;

[0046]FIG. 35 shows the section according to the line XXXV-XXXV in FIG.34, with the mounting head omitted;

[0047]FIG. 36 shows the view in the direction of the arrow XXXVI in FIG.35.

[0048] There is illustrated and described first and foremost withreference to FIG. 1, a hydraulic apparatus 1 in the form of a manualpressing apparatus, which is operated by electric motor. A pressingapparatus of this kind is known from the German Patent Applicationmentioned at the outset with the file number 198 25 160.2. Attention isalso drawn to German Patent Application 197 43 747. The content of thispatent application also is hereby to be incorporated as to its fullcontent into the disclosure of the present invention, also for thepurpose of incorporating features of this patent application into claimsof the present invention.

[0049] An electric motor is located in the apparatus 1. Drive of thiselectric motor is effected by means of a battery 3 integrated into ahandle 2. When a finger-actuatable switch 5 is actuated, oil is pumpedout of a reservoir into a pressure space, whereby a hydraulic cylinder 4is moved in the direction of its working end position against the actionof a return spring.

[0050] The return movement of the hydraulic cylinder 4 is effected by areturn spring as soon as a return valve opens when a predeterminedmaximum pressure is exceeded.

[0051] The apparatus illustrated in FIG. 2 is formed as a manuallyactuated apparatus. The pressure required to displace the hydrauliccylinder 4 is accordingly not built up by an electric motor but bymanual actuation using a pumping lever 6.

[0052] Irrespective of the form of the apparatus 1, it has a neck 7which surrounds the hydraulic cylinder 4 and on which a mounting head 8for receiving tools W can be located. The arrangement of the mountinghead 8 on the neck 7 is preferably such that the mounting head 8 can berotated about the axis of the neck.

[0053] As can be seen especially from FIGS. 3 and 4, the mounting head 8is formed substantially as a rectangular guide 9 which can be closed andopened and has a long side which is aligned in elongation of the pistonaxis and a narrow side, the length of which corresponds approximately tohalf the length of the longitudinal side of the rectangular guide 9.

[0054] The mounting head 8 or the rectangular guide 9 is ofsubstantially three-piece form. One part is formed as an angled piece 10which includes one longitudinal side and has a longitudinal-side piece11, a narrow-side piece 12 extending at right angles to the piece 11,and a longitudinal-side portion 13 which runs parallel to thelongitudinal-side piece 11 but extends over only about half the lengthof the piece 11. Consequently, the angled piece 10 is U-shaped in sideview, with a longer limb—the longitudinal-side piece 11—and a shorterlimb—the longitudinal-side portion 13.

[0055] The second part of the rectangular guide 9 forms alongitudinal-side piece 14 with a width, measured transversely to thedirection of extent of the rectangular guide 9, i.e. measuredtransversely to the piston axis, corresponding to that of the angledpiece 10.

[0056] The third part of the rectangular guide 9 is formed as a secondnarrow-side piece 15, and, in the particular embodiment exampleillustrated, two narrow-side pieces 15 are provided, at a spacing fromone another. These pieces are connected to one another by a flange 16 ofcircular cross-section to enable the mounting head 8 to be located onthe neck 7. Both the longitudinal-side piece 14 and the angled piece 10are pivotably mounted in the space formed between the narrow-side pieces15.

[0057] For this purpose, the narrow-side pieces 15 and also a region ofthe longitudinal-side piece 14 and the free end of the longer U-limb ofthe angled piece 10 are each penetrated by a pin 17, which is secured bycirclips 18 on the outer wall of the narrow-side pieces 15 against beingpulled out.

[0058] The longitudinal-side piece 14 of the rectangular guide 9 can bebrought into overlap with the longitudinal-side portion 13 of the angledpiece 10, for which purpose the latter has a thickness correspondingapproximately to half the thickness of the longitudinal-side piece 14 inthe region of the joint. On its underside, the piece 14 has anopen-edged recess 19 which is associated with the longitudinal-sideportion 13, the length of this recess being somewhat greater than thelength of the longitudinal-side portion 13. The latter can beaccommodated fully in the recess 19 to form a side piece with a uniformthickness and width all the way along (in this connection see also FIG.6).

[0059] To fix the angled piece 10 or, more specifically, itslongitudinal-side portion 13 on the longitudinal-side piece 14, thelongitudinal-side portion 13 is provided on its upper side with anelongate projection 20, the front end region 21 of which, which facesthe narrow-side piece 12, is undercut. This projection 20 enters acorrespondingly shaped and aligned longitudinal slot 22 in thelongitudinal-side piece 14, and this longitudinal slot 22 also has anundercut end zone 23. In the closed position according to FIG. 6, theangled piece 10 is thus held in a positive-locking manner by itsprojection 20 in the longitudinal slot 22 of the longitudinal-side piece14 and it therefore requires deliberate action to effect opening of themounting head 8.

[0060] The two pieces rotatably mounted between the narrow-side pieces15—angled piece 10 and longitudinal-side piece 14—are biassed in theopening direction. The relevant springs bear the reference numerals 24and 25.

[0061] In the embodiment example illustrated, two adjacently locatedgrooves 26 extending in the longitudinal direction of the mounting head8, i.e. parallel to the piston axis, are furthermore machined into thelongitudinal-side pieces 11 and 14 and also into the longitudinal-sideportion 13 complementing the longitudinal-side piece 14 on the inside.These grooves extend over the entire length between the narrow-sidepieces 12 and 15.

[0062] Located between the two narrow-side pieces 15 is a slide 27,which is in connection at the rear with the hydraulic cylinder 4. At thetop and bottom, this slide 27 has respective raised tongues 28 forguiding it in one of the grooves 26. However, it is also conceivable toprovide just one tongue 28, this being at the top or the bottom.

[0063] At the rear, facing the hydraulic cylinder 4, thehammer-head-like slide 27 has a centrally located spigot 29 which sitsin a correspondingly formed central hole 30 in the hydraulic cylinder 4,the said hole starting from the end face. The spigot 29 is held captivein this hole 30 in a positive-locking manner by a transverse pin 31.

[0064] Two securing means 32, each associated with the narrow sides, areprovided for the purpose of fixing the tools W in the mounting head 8or, more specifically in the rectangular guide 9. These securing meansare formed as positive-locking pins 33 which can be displacedtransversely to the direction of motion of the tools W and of thehydraulic cylinder 4 and, accordingly, likewise transversely to thelongitudinal direction of the mounting head 8 which is provided in theform of a rectangular guide 9.

[0065] One securing means 32 is located centrally on the narrow-sidepiece 12. The second securing means 32 is positioned on the displaceableslide 27.

[0066] As can be seen, in particular, from the sectional view in FIG.10, the securing means 32 formed by a positive-locking pin 33 can bedisplaced against a spring 35 inserted into a stepped hole 34 in thenarrow-side piece 12 (and in the slide 27). FIG. 7 shows the initialposition of the securing means 32 for the positive fixing of the tool W.FIG. 10 shows the securing means 32 after a displacement of the means inthe direction of arrow r into a release position for the tool W.

[0067] The positive-locking pin 33 has sections of different diameterarranged axially one after the other; for instance, two positive-lockingsections 36 of larger diameter, adjoining which in the direction r ofdisplacement of the securing means 32 are release sections 37 of reduceddiameter. To facilitate actuation of the securing means 32, it isprovided at one end with a dish-like actuating plate 38.

[0068] The form of the fixing means 32 is furthermore chosen in such away that positive-locking engagement with the tool W to be held can beachieved on both sides of the narrow-side piece 12 and the slide 27,i.e. on both sides at the ends of the fixing means 32.

[0069]FIGS. 5 and 5a show the mounting head 8 held in the open position,with various pairs of tools W and pairs of adaptors A which can beassociated with it, the latter being for receiving commerciallyavailable tools W′. The latter tools W′, which can be associated bymeans of adaptors A, are preferably pressing tools. The tools W whichcan be located and displaced directly in the mounting head 8 arepreferably provided as cutting tools.

[0070] FIGS. 6 to 13 show the arrangement of a first pair of cuttingtools W. These cutting tools W are formed as identically shaped cuttingjaws 39 and are arranged in mirror symmetry in the mounting head 8.

[0071] As can be seen from the detail view of the two cutting jaws 39shown in FIG. 11, these jaws have undercut cutting edges 41 extending,with a concave curvature in the direction z of displacement, on the endfaces 40 which lie opposite one another in the direction z ofdisplacement.

[0072] Unlike the configuration described previously, the cutting jaws39 are guided in a mounting head 8 using just one groove 26 formed to beof appropriate width, each cutting jaw 39 taking up half the width ofthe groove when viewed transversely to the direction z of displacement,thereby allowing the cutting jaws 39 to move past one another.

[0073] Each cutting jaw 39 has two adjacent tongues 42, 43 extending inthe direction z of displacement of the tool W to form a tongue andgroove arrangement, tongue 42 lying in groove 26, with the width of thetongue corresponding approximately to half the width of the groove.

[0074] Tongue 43 overlaps the outwardly-located groove wall 44 formed bythe groove 26, having a tongue width which corresponds approximately tohalf the width of the tongue 42. As a result of this configuration, thetools W—here the cutting jaws 39—are guided in a common groove 26 withadditional support on oppositely-located outer surfaces of groove walls44.

[0075] The tongues 42 and 43 extend over the entire length of therespective cutting jaw 39, as viewed in the direction z of displacement,the respective free end face 40 being bevelled approximately at an angleof 45°.

[0076] Each tool W—here cutting jaw 39—is held on the mounting head 8or, more precisely on the narrow-side piece 12, on the one hand, and onthe slide 27, on the other hand, by means of a mounting lug 45. Thismounting lug 45 is in alignment with an outer surface 46 of the tool W,the tongues 43 engaging over the groove wall 44 projecting beyond thisouter surface 46.

[0077] In the direction z of displacement of the tool W, each mountinglug 45 projects beyond the rear boundary surface 47 of the tool and ishere formed centrally in terms of height. In the exemplary embodimentillustrated, the mounting lug 45 is formed integrally with the tool W.

[0078] The mounting lug 45 is formed fork-shaped, with a relativelysmall insertion opening 48 which changes into an enlarged centralretaining opening 49.

[0079] The width of the insertion opening 48 is somewhat larger than thediameter of the release section 37 of the positive-locking pin 33. Theretaining opening 49 has a diameter which corresponds substantially tothat of the positive-locking section 36 of the positive-locking pin 33.

[0080] To put the apparatus 1 into operation with the tools W shown inFIGS. 6 to 13, a tool W or cutting jaw 39 must be positioned such thatits mounting lug 45 enters into the region of the securing means 32. Bydisplacement of the positive-locking pin 33 in the direction of arrow r,insertion of the release section 37 into the retaining opening 49 isenabled by displacement of the cutting jaw 39. Release of thepositive-locking pin 33 by letting it go effects subsequent returndisplacement of the pin with spring assistance for positive engagementof the positive-locking section 36 in the retaining opening 49 of themounting lug 45. The cutting jaw 39 is then fixed in a positive-lockingmanner, both as regards the one cutting jaw 39 on the narrow-side piece12 and as regards the other cutting jaw 39 on the slide 27. In theregion of the positive-locking pin 33, the narrow-side piece 12 hasdepressions on both sides to accommodate the mounting lug 45.

[0081] By actuation of the apparatus 1, e.g. by pressing actuation ofthe button 5, the slide 27 is moved in the direction z of displacementby the hydraulic cylinder 4, taking along the tool W associated withit—here the cutting jaw 39. In the course of the cutting operation, thecutting edges 41 of the tools W are guided past one another (cf. FIGS.12 and 13). During this cutting operation, force-dependent control ofthe apparatus 1 is effected.

[0082] FIGS. 14 to 17 show another exemplary embodiment of a cuttingtool W with cutting jaws 50. As in the exemplary embodiments describedabove, these also are guided in a common groove 26 in the mounting head8.

[0083] These cutting jaws 50 are likewise of identical form and arrangedin mirror symmetry in the mounting head 8.

[0084] Each cutting jaw 50 or tool W has a tongue 42, the width of whichmeasured transversely to the direction z of displacement corresponds tothe width of the groove 26.

[0085] The working width of the tool is chosen to be less than the widthof the tongue. In this specific case, a working width a chosen for thetool corresponds approximately to half the width b of the tongue.

[0086] The arrangement is furthermore chosen in such a way that an outersurface 46 of the working portion of the tool W is flush with an outersurface of the tongue 42. Accordingly, the working region extendstransversely to the direction z of displacement as far as the centre ofthe tongue 42.

[0087] To allow the cutting jaws 50 to move past one another in thedirection z of displacement, the respective length of a tongue 42measured in the direction z of displacement is less than the totallength of the tool W or the cutting jaw 50. In the exemplary embodimentillustrated, the tongue 42 starts from a rear boundary surface 47 andextends over approximately half the total length of the tool W. In thismanner. interpenetration of the cutting jaws 50 is enabled, the tonguesections which project beyond the working width of the tool receivingthe working region of the other tool W which projects in the direction zof displacement.

[0088] By virtue of the configuration chosen, the tools W in thisembodiment are guided on the outside by the groove walls 44.

[0089] A mounting lug 45 projecting relative to the outer surface 46 isassociated with each tool W, here each cutting jaw 50, which mountinglug 45 is, for example, connected to the cutting jaw 50 by riveting.

[0090] The arrangement and positive mounting of the cutting jaws 50 iseffected in the same way as in the previously described exemplaryembodiment, by means of the displaceable positive-locking pins 33.

[0091] In FIGS. 18 to 21, there is shown another exemplary embodiment oftools W in the form of cutting jaws 51, which are guided in two mutuallyadjacent grooves 26 in the mounting head 8.

[0092] The width of each cutting jaw 51 measured transversely to thedirection z of displacement corresponds to half the spacing dimensionbetween the outwardly-disposed groove walls 44 of the mounting head 8.For guidance in an associated groove 26, each cutting jaw 51 has atongue 42, accordingly two opposite-located tongues 42 to match each ofthe oppositely-located grooves 26. The tongue width is selectedcorrespondingly less than the total width of the tool W.

[0093] Here too, the cutting edges 41 are formed with a concavecurvature with an undercut, an arrangement of the cutting edges 41 inthe tongueless region of the cutting jaw 51 being chosen.

[0094] The cutting jaws 51 are supported at the outside by theoutwardly-disposed groove walls 44. Support on the inner side isprovided by the inner groove wall 52 separating the grooves 26.

[0095] The mounting lugs 45 used to fix the cutting jaws 51 are providedon the outer surface 46 as in the exemplary embodiment described above,being, for example, connected to the cutting jaws 51 by rivetting.

[0096] On actuation of the apparatus 1, the cutting jaw 51 that can beconnected in a positive-locking manner to the slide 17 can be moved pastthe fixed tool—here the cutting jaw 51 joined in a positive-lockingmanner to the narrow-side piece 12.

[0097] Irrespective of which of the three exemplary embodimentsdescribed above and shown in FIGS. 6 to 13, 14 to 17 or 18 to 21 isconsidered, the cutting plane E is located centrally with respect to themounting head 8, when viewed in the direction z of displacement, i.e.for a construction with a groove 26 at its centre, and for anarrangement of two grooves 26 running alongside one another, centrallywith respect to the inner groove wall 52 separating them.

[0098] The path of displacement of the movable tool, i.e. the cuttingjaw 39, 50 or 51 associated with the slide 27, is furthermore alwaysdimensioned in such a way that, in the maximum displacement position,its cutting edge 41 lies behind the cutting edge 41 of the fixed cuttingjaw 39, 50 or 51 in the direction z of displacement. As mentioned,force-dependent control of the apparatus is also effected during acutting operation. Automatic stopping of the forward displacement of thehydraulic cylinder 4 within the apparatus 1 and, in addition, automaticreturn travel of the piston together with the associated slide 27 andthe tool W mounted on it into the initial position is effected by themovable cutting jaw striking, for example, against the narrow-side piece12 carrying the fixed jaw, and the associated rise in the opposingforce.

[0099]FIGS. 22 and 23 show, in another embodiment, tools W in the formof profile cutting jaws 53 for cutting to length elongate profiles, inparticular drawn profiles. Each cutting jaw 53 is formed substantiallyplate-shaped, with a length/height ratio of about 3:2, the longer sideextending in the direction z of displacement. The thickness of eachcutting jaw 53, measured transversely to the direction z ofdisplacement, corresponds to half the spacing between the outer groovewalls 44 bounding the two grooves 26 located alongside one another. Inthe installed situation, the outer surface 46 of each profile cuttingjaw 53 is aligned with the outer surfaces of the groove walls 44,according to FIGS. 22 and 23.

[0100] For the purpose of guiding the profile cutting jaws 53, these areprovided at the top and bottom with tongues 28 for guiding them in thegrooves 26 in the mounting head. The tongues 28 extend over the entirelength of each cutting jaw 53.

[0101] Mounting sections 45 projecting beyond the rear boundary surface47 are secured, in particular riveted, to the outer surface 46.

[0102] The two profile cutting jaws 53 forming a pair of tools haveidentical cut-outs 54 which pass transversely through each cutting jaw53 and correspond to the profile cross section of the workpiece to becut to length. Thus in the exemplary embodiment illustrated, the cut-out54 chosen corresponds to an unclosed hollow profile of rectangular crosssection.

[0103] In the stop-limited initial position according to FIG. 22, theprofile cutting jaws 53 are positioned in such a way relative to oneanother that their cut-outs 54 coincide. In this position, the workpieceto be cut to length can be pushed through the coinciding cut-outs 54.

[0104] Here, as in the exemplary embodiments described above, thecutting plane E lies centrally between the two outer groove walls 44,parallel to the direction z of displacement, and is therefore situatedcentrally on the inner groove wall 52, which separates the two grooves26 of the mounting head 8 from one another.

[0105] By actuation of the apparatus 1, the cutting jaw 53 secured tothe slide 27 by the mounting lug 45 is displaced parallel to the fixedcutting jaw 53 mounted on the narrow-side piece 12. There is thuseffected a simultaneous parallel displacement of the cut-outs 54, whichresults in cutting of the workpiece in the region of the cutting planeE. The cross-sectional shape of the workpiece is always maintained byvirtue of the fact that the boundary walls of the cut-outs aresurrounded on all sides. No deformations occur in the region of thecutting plane E.

[0106] FIGS. 24 to 29 show various embodiments of adaptor arrangementsin the mounting head 8 for holding commercially available tools W′ to beused with known pressing devices, in particular pressing tools.

[0107] FIGS. 24 to 25 show a pair of adapters in the form of latch-inmounts 55. At the top and bottom, these each have two tongues 42 guidedin the grooves 26 in the mounting head 8. The latch-in mount 55 extendsbeyond the tongues 42 on both sides of the tongues 42, i.e. transverselyto the direction z of displacement, to form a respective projectingshoulder 56, giving a total width of each latch-in mount 55 whichcorresponds to that of the mounting head 8 and of each longitudinal-sidepiece 11 and 14. The respective outer surface 46 of each latch-in mount55 is accordingly aligned with the associated outer surface of themounting head 8 or the rectangular guide 9.

[0108] Each latch-in mount 55 is provided with two oppositely-locatedmounting lugs 45. This results in a fork-shaped configuration of themounting region. The two mounting lugs 45 accommodate between themeither the tapered mounting region of the narrow-side piece 12 or theslide 27. Both positive-locking sections 36 of each positive-locking pin33 come into effect here in that each positive-locking section 36 entersin a positive-locking manner into the respectively associated retainingopening 49 of the mounting lug 45.

[0109] In terms of the plane in which they are located, the mountinglugs 45 are arranged set back relative to the outer surface 46 of thelatch-in mount 55, i.e. transversely to the direction z of displacement,because of the projecting shoulder 56 provided in each case.

[0110] To accommodate a tool W′—here a pressing tool—each latch-in mount55 is provided, on the end faces 57 which are disposed opposite oneanother in the direction z of displacement, with cut-outs 58 whichextend curved in the direction z of displacement. In the exemplaryembodiment illustrated, the cut-outs are formed to be of semi-circularshape in a side view in accordance with FIG. 24.

[0111] Before a transition to the remainder of the end surfaces 57,which run perpendicularly to the direction z of displacement, the endregions of the cut-outs are formed as inwardly-directed ribs 59extending transversely to the direction z of displacement. According tothe exemplary embodiment illustrated, these ribs 59 can extend over theentire width, measured transversely to the direction z of displacement,of each latch-in mount 55. However, it is also conceivable for theseribs 59 to be provided shortened at one end.

[0112] Tools W′ in the form of pressing jaws 60 formed to becorrespondingly semicircular can be inserted laterally, transversely tothe direction z of displacement, into these cut-outs 58 provided withthe ribs 59, the pressing jaws 60 having grooves 61, corresponding tothe ribs 59. By virtue of this configuration, the commercially availablepressing jaws 60 are held in a positive-locking manner in the adaptorsA.

[0113] For secure fixing of the pressing jaws 60 in the adaptors A, thelatter have a, preferably spring-supported, latching projection 62 inthe rear region of each cut-out 58, this projection entering into anassociated rear groove 63 in the associated pressing jaw 60 (compare inthis connection FIG. 5a).

[0114] To cancel this latching and remove the pressing jaws 60, eachadaptor A has on its outer surface 46 a finger-actuatable releasingdevice 64, by which a reverse displacement of the latching projection 62is enabled when the pressing jaw 60 is pulled out laterally.

[0115] In FIGS. 26 and 27, there is shown another exemplary embodimentof an adaptor A, the latch-in mounts 65 of which are likewise providedwith two oppositely-located mounting lugs 45, the outer surfaces ofwhich are aligned with the outer surfaces 46 of the adaptor A. Inaddition, this latch-in mount 65 is provided both at the top and at thebottom with two tongues 42 running parallel to one another as in theexemplary embodiment described above.

[0116] Furthermore, this latch-in mount 65 also has a cut-out 66 whichis semicircular in side view in accordance with FIG. 26 and the endregions of which open into end-face stubs 67 extending perpendicularlyto the direction z of displacement.

[0117] These adaptors A serve to receive tools W′—here pressing tools68—which have a semicircular contour formed to correspond to thecut-outs 66. As in the exemplary embodiment described above, thesepressing tools 68 are accommodated fully in the cut-out section of theadaptor A, so that the end faces of the pressing tools 68 lying oppositeone another in the installation position according to FIG. 26 arealigned with those of the adaptors A.

[0118] To fix the pressing tools 68 in the latch-in mounts 65, thepressing tools 68 are provided centrally at the rear with pins 69aligned in or counter to the direction z of displacement for entry intocorresponding receiving features 70 in the latch-in mounts 65. In thisway, a kind of catch coupling is provided.

[0119]FIGS. 28 and 29 show an exemplary embodiment in which an adaptor Ais used merely to guide and align a commercially available tool W. Here,each adaptor A is provided as a guide piece 71 with two tongues 42running parallel provided at the top and bottom. Each outer surface 46is flush with the associated tongue 42, and this adaptor A thus extendsbetween the groove walls 44 of the mounting head 8.

[0120] This guide piece 71 also has a cut-out 72 which is semicircularin side view in accordance with FIG. 28 and opens into end-face stubs 73extending perpendicularly to the direction z of displacement.

[0121] The associated tool W′—here pressing tool 74—is formedfork-shaped, each limb of the fork being shaped as a mounting lug 45.The tool head 75 is shaped to correspond to the cut-out 72 of theadaptor A and, accordingly, lies in a positive-locking manner in thisregion.

[0122] The mounting lugs 45 overlap the adaptor A to fix adapter A andtool W′, the adaptor A being held captive between the tool W′ and thenarrow-side piece 12 and, respectively, between the tool W′ and theslide 27. The tool W′ is accordingly secured by engagement of theadaptor A over it.

[0123] Further embodiments of adaptors A for receiving tools W′ arefurthermore conceivable. Thus, FIG. 5a shows two further embodiments, inwhich, on the one hand, a latch-in mount 76 provided with two mountinglugs 45 located opposite to one another is provided in the region of acut-out with grooves extending in the direction z of displacement toreceive a tool W′ formed as a pressing tool 77 and havingcorrespondingly aligned tongues to form a tongue and groove connection.

[0124] Adaptors A are furthermore shown in the form of latch-in mounts78. These likewise have two tongues 42 at the top and bottom. The outersurfaces 46 of these adaptors A are aligned with those of the tongues42. Here, a mounting lug 45 is provided in each case, this lug engagingon the outer surface 46 and being connected, in particular riveted, tothe adaptor A.

[0125] In this exemplary embodiment, the latch-in mount 78 hasprojections in the form of tongues extending in the direction z ofdisplacement in the region of a U-shaped cut-out open towards theoppositely-located adaptor A. These projections are received bycorrespondingly shaped grooves in the tool W′ to be inserted—here apressing tool 79.

[0126] In the representations of FIGS. 30 and 31, there is shown anotherembodiment of a tool W for cutting threaded rods.

[0127] The cutting jaws 89, which are each provided with a tongue 42 atthe top and bottom, have a width, measured transversely to the directionz of displacement, which corresponds approximately to twice the width ofthe tongues. The mutually facing end faces 40 extend substantially atright angles to the outer surface 46.

[0128] Each tool W or cutting jaw 89 is provided with a recess 90 whichwidens towards the respective end face 40. In a side view in accordancewith FIG. 30, this recess 90 approximates to a triangle, the tip ofwhich, which faces away from the other tool W, is rounded. Morespecifically, this tip region is of semicircular shape in plan view. Thesurfaces of the recess adjoin this tip region tangentially. The recess90 passes through the tool W over its entire width.

[0129] The tip region is provided with a thread to form an externallythreaded section 91.

[0130] The side edges of the oppositely-located externally threadedsections 91, which side edges lead past one another in the cutting planeE, form cutting edges 41.

[0131] At the side, the cutting jaw 89 to be connected to the slide 27has an extension 92 which extends at right angles to the outer surface46 and at the free end of which a shell-shaped support 93 is provided,the support being located at a spacing from the outer surface 46. In aside view in accordance with FIG. 30, the support 93 has a semicircularshape which, in a projection onto the outer surface 46, represents acomplement to the semicircular externally threaded section 91.Accordingly, the shell of the support 93 is aligned coaxially with theexternally threaded section 91, with a semicircular opening which liesopposite that of the externally threaded section 91. As a result of thisconfiguration, cutting of threaded rods is enabled, the shell-shapedsupport 93 preventing the threaded rod from being pulled askew.

[0132] Moreover, in FIGS. 32 to 33, an arrangement is shown in which areceiving member 101 in the form of two adaptors is located in themounting head 8 for the arrangement and control of a working component102 in the form of tools W′ disposed outside the mounting head 8. Inthis exemplary embodiment, the pair of tools forms a shears-type tool100, in particular a bolt cutter 80.

[0133] The adaptors A each have a wide tongue 42 at the top and bottomto guide them in a wide groove 26 formed in the mounting head 8 betweentwo groove walls 44. In this case, it would be perfectly conceivable tohave a construction with two tongues 42 guided in two parallel grooves26 as in the exemplary embodiments described above.

[0134] Each adaptor A has two oppositely-located mounting lugs 45 forforked fixing on the narrow-side piece 12, on the one hand, and on themovable slide 27, on the other hand.

[0135] That adaptor A of the receiving member 101 which is associatedwith the narrow-side piece 12 is formed as a fixed part 106 and projectson one side from the region of the mounting head 8 to form a mountingsection 81 which extends in the direction z of displacement and projectsfreely at the front beyond the free end of the mounting head 8. At itsfree end, on the inner side facing the mounting head 8, the saidmounting section carries a fixed jaw 82 of the bolt cutter 8. The fixedjaw 82 is accordingly substantially in extension of the mounting head 8,an end face 83 of the fixed jaw 82, the said end face facing themounting head 8, being at a spacing from the associated end face of thenarrow-side piece 12 of the mounting head 8 in order to allow thereceiving member 101 to be pushed on and, finally, fixed by thepositive-locking engagement of securing means 32 and mounting lugs 45.

[0136] Pivoting jaw 85 of the shears type tool 100 is mounted movably onthe fixed jaw 82 by means of a pin 84.

[0137] The tool is controlled by means of a link 86, which is secured atone end to an arm 87 on the pivoting jaw, and at the other end, to thatadaptor A of the receiving member 101 which is fixed to the slide 27 andis formed as a moving part 103. This link 86 extends at the side of themounting head 8 and is mounted removably either in the region of themoving part 103 or in the region of the pivoting jaw 85 to allowmounting or removal of the adaptors A to be provided with the tool W′.

[0138] By actuation of the apparatus 1, this being associated with thedisplacement of the moving part 103 connected to the slide 27 in thedirection z of displacement, the pivoting jaw 85 is pivoted about itspin 84, with simultaneous closing of the mouth 88 of the shears.

[0139] The mounting lugs 45, in particular those of the adaptor Aforming the moving part 103, can be omitted if automatic return of thebolt cutter 80 is provided when reverse displacement of the hydrauliccylinder 4 takes place. Thus, for example, a spring located in theregion of the pivot 84 can load the cutting jaws of the bolt cutter 80into the open position, with the result that, when reverse displacementof the hydraulic cylinder 4 takes place, the downward-pivoting jaw 85moves the moving part 103 back towards the hydraulic cylinder 4 in thesame direction by way of the link 86.

[0140] FIGS. 34 to 36 show another embodiment. Here, the mounting head 8is provided with tools W′ to form a hole punch 104.

[0141] Here too, a, moving part 103 is provided which can be moved onthe hydraulic cylinder 4 in grooves 26 in the mounting head 8 by meansof mounting lugs 45 and which, in the exemplary embodiment illustrated,is formed as a hollowed-out piston 105.

[0142] A fixed part 106 associated with the narrow-side piece 12 isprovided—if appropriate by way of mounting lugs— to complement thereceiving member 101 held in the mounting head 8, which fixed part 106is provided in the exemplary embodiment illustrated in the manner of ahollow cylinder and serves to accommodate the piston 105 on the movingpart.

[0143] Consequently, the piston 105 forming the moving part 103 is atleast partially accommodated in the fixed part 106 and guided in it inthe direction z of displacement.

[0144] The fixed part 106 carries the actual hole-punching device, thealignment of the latter being selected perpendicular to the direction zof displacement and thus perpendicular to the direction of displacementof the piston 105.

[0145] The working part 102 aligned perpendicularly to the direction zof displacement has a counter-holder 108 and an anchoring device 110,which has an internal thread, for securing a tie bolt 109.

[0146] The counter-holder part 108 can be moved relative to theanchoring device 110, i.e. is arranged in such a way that it can beextended. The anchoring device 110, in contrast, is secured in a fixedmanner to the fixed part 106, more specifically by means of a cylinderhousing 111 for a hydraulic piston 112. The cylinder housing 111 hastongues 42 in accordance with the exemplary embodiments described above.

[0147] To move the counter-holder 108, it is acted upon by the hydraulicpiston 112, which, for its part, is supported in its illustratedunactuated position on an underside of the fixed anchoring device 110 bymeans of a compression spring 113.

[0148] A quantity of hydraulic fluid is accommodated in thecavity—located on the fixed-part side—of the holding element 101 for thepurpose of loading the hydraulic piston 112. The loading is effected byactuation of the apparatus 1, causing the moving part 103 formed as apiston 107 to travel into the cavity and, in the process, displace thequantity of hydraulic fluid through a side passage 114 alignedperpendicularly to the direction z of displacement, for the purpose ofloading the rear side of the hydraulic piston 112.

[0149] The counter-holder 108 is connected firmly to the hydraulicpiston 112 by means of retaining screws 115, the hydraulically induceddisplacement of the piston 112 thus resulting in an axial displacementof the counter-holder 108. In the course of this axial displacement, thecounter-holder 108 or the tool carried by it passes over a counter-toolmounted on the tie bolt to punch holes in a metal sheet 116.

[0150] In this particular case, the configuration is chosen such thatthe counter-holder 108 carries a first tool W′ and the hole punch 109carries a second tool W′, the cutting edges of which are guided past oneanother in the course of the cutting or punching operation.

[0151] As the hydraulic cylinder 4 moves back, reverse displacement ofthe piston 105 back into the initial position is simultaneously effectedby means of the compression spring 113 acting on the hydraulic piston112.

[0152] The arrangement can furthermore also be chosen in such a way thatthe hole-punching device forming the working part 102 is alignedcoaxially with the moving part 103 or piston 107, for example when theentire device is arranged to the side, outside the mounting head 8.

[0153] All features disclosed are pertinent to the invention. Thedisclosure content of the associated/attached priority documents (copyof the prior application) is herewith also incorporated as to its fullcontent into the disclosure of the application, also for the purpose ofincluding features of these documents in claims of the presentapplication.

What is claimed is:
 1. Tool or adaptor for receiving a tool for securingin a mounting head, characterized by a fork-shaped mounting lug whichprojects in the direction of displacement and has an enlarged retainingopening starting from a smaller insertion opening.
 2. Tool or adaptoraccording to claim 1 , characterized in that the mounting lug isarranged relative to the tool or the adapter so as to projecttransversely to the direction of displacement.
 3. Tool or adaptoraccording to claim 1 , characterized in that the mounting lug isprovided to be aligned with an outer surface of the tool or of theadaptor.
 4. Tool or adaptor according to claim 1 , characterized in thattwo oppositely-located mounting lugs are provided.
 5. Tool or adaptoraccording to claim 1 , characterized in that the tool or the adaptor hasone or, optionally, two tongues located beside one another and extendingin the direction of displacement of the tool or of the adaptor.
 6. Toolor adaptor according to claim 1 , characterized in that the tool oradaptor has a tool working width which is less than the tongue width. 7.Tool or adaptor according to claim 1 , characterized in that the tongueextends overonly part of the length of the tool or of the adaptor. 8.Tool or adaptor according to claim 1 , characterized in that the adaptorhas a projecting shoulder on both sides of the tongue.
 9. Tool oradaptor according to claim 1 , characterized in that the side face ofthe adaptor is aligned with the side face of the tongue.
 10. Tool oradaptor according to claim 1 , characterized in that the securing lug isprovided on the tool and in that the securing lug engages over theadaptor.
 11. Pair of tools according to claim 10 , characterized bycutting edges formed on end faces, the end faces being located oppositeone another in the direction of displacement and the cutting edgesextending in a curved manner in the direction of displacement.
 12. Pairof tools according to claim 10 , characterized by externally threadedsections which adjoin the cutting edges at the side and are alignedtransversely to the direction of displacement.
 13. Pair of toolsaccording to claim 10 , characterized in that one tool has ashell-shaped support on the side facing away from the cutting edge, theshell being disposed at a spacing from and coaxial with the externallythreaded section.
 14. Tool for securing in a mounting head of ahydraulic apparatus, characterized by a receiving member to be securedin the mounting head and by a working part, which is situated outsidethe mounting head, such as a cutting jaw or a hole punch.
 15. Toolaccording to claim 14 , characterized in that the receiving membercomprises a fixed part and a moving part.
 16. Tool according to claim 14, characterized in that the moving part is formed as a piston whichcooperates with a quantity of hydraulic fluid in the fixed part. 17.Tool according to claim 14 , characterized in that the tool is ashears-type tool.
 18. Tool according to claim 14 , characterized in thatthe fixed part is connected to a fixed jaw of the shears-type tool. 19.Tool according to claim 14 , characterized in that the moving part isconnected to a pivoting jaw of the shears-type tool.
 20. Tool accordingto claim 14 , characterized in that the tool is a hole punch.
 21. Toolaccording to claim 14 , characterized in that the moving part is formedas a cylinder which is accommodated in the cylinder-type fixed part.